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Novel Laser Optic Enables Shorter Ultrafast Pulses The new Spectral Shaping Filter from Alpine Research Optics (ARO, Boulder, CO) provides a simple route to shorter pulses (as short as 5 femtoseconds) from Titanium:sapphire ultrafast amplifiers. This new intra-cavity optic is a dielectric coated filter with a spectral transmission curve designed to precisely compensate for the problem of spectral narrowing due to gain flattening. (Spectral narrowing results in pulse lengthening in transform-limited laser pulses).
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